Looking for information on John Leitz/Lietz b. May 1840, d. October 1928. John's children were divided: half adopted the name of Lietz, and the other half kept Leitz. This family was in Fond du Lac County, WI since roughly 1860. Trying to ascertain immigration/naturalization information, as well as name of previous generation (the parents of John were not listed on his death certificate).